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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8e5c4be8f0d87df272a156496bdecfabc6dd36265200a124a209e6a9a4d1ece' 
  AND token = '79VtxxmlhksU97nyrYbKnczBtM01iks4Vf2ZLRhVdZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}